Put the eggwhites into the bowl of an electric mixer with the whisk attachment. Turn the motor on high and gradually add the caster sugar as the mixture continually whisks to firm peak stage.
Remove the whipped eggwhites from the machine and sift the icing sugar over the top. Fold the icing sugar through with a spatula until well incorporated. Lightly spray two large silicone baking mats with vegetable oil. Place
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